The condenser is a heat exchanger where the refrigeration system gets rid of all the heat that's been removed from the compartments and the heat generated by the compressor itself. It's called a condenser because the refrigerant enters as a vapor but, as it cools, it condenses to a liquid. A dirty condenser will make ANY refrigerator warm up-- this is not unique to Sub-Zeros.

BTW, the condenser on the Sub-Zero 550 is up on top, behind the front grill. On most other refrigerators, the condenser is located at the very bottom of the refrigerator, either in back with the compressor or in front behind the plastic toe grill. Here are a couple tools that will help you clean the bottom condensers:

The other common cause for this problem is a bad condenser fan motor. If the condenser fan motor in your refrigerator is burned out, you can buy the replacement motor here ==> http://www.repaircli.../4200740/753856

You can find whatever appliance part you need through the parts search box right here at The Appliantology Academy. No harm in buying and trying with our 365-day, no-hassle return policy, even on electrical parts that were installed!

The Appliance Guru provides prompt, convenient service in the following towns in New Hampshire: New London, Elkins, Wilmot, Springfield, Georges Mills, Sunapee, Mt. Sunapee, Newbury, Sutton, Bradford, Warner, Grantham, and the Eastman Community. Visit our website for more info and a discount coupon on your next service call: ==> http://applianceguru.com